Alpha-like four-body correlations and molecule-like structure in nuclei in the fp-sell region

1.结果表明，包含α -光谱因子的^<44>Ti的结构在α -星团模型中得到了一致的理解。从1.9 MeV开始的K = 0^+波段可以用考虑了核心激发的α -星团模型来解释。在^<36>Ar (^6Li, d) ^<40>Ca反应中观察到^<40>Ca中预测的K = 0^-波段，发现该波段的α光谱因子是破碎的。采用考虑核激发的半微观α +^<36>Ar正交性条件模型，可以较好地再现实验能级、光谱因子和B （E2）值。结果表明，该模型不仅能再现类簇状态，还能同时再现类壳模型状态。揭示了簇壳结构共存的机理。在α +^<38>Ar正交性条件模型中研究了^<42>Ca的结构。模型能较好地再现实验能级和B（…More E2）值。在^<42>Ca.4中发现簇和壳结构同时存在。后半部分从束缚态和散射态统一的角度研究了sd-壳的α -聚类问题。通过对^<38>Ar的α -团簇结构的研究，表明该区域存在弱耦合和α -团簇结构。将原子核类分子结构的观点推广到更重的区域。结果表明，采用双折叠模型，复合体系^<90>Zr和^<208>Pb的α -散射和^<94>Mo和^<212>Po的基带分别可以同时得到较好的再现。这表明这些核的基带是从α星团的观点来理解的。研究了^<94>Mo和^<212>Po的光谱性质和能带结构。星团模型很好地再现了^<212>Po基态的大α衰变宽度。综上所述，理论和实验发现α -团簇结构在fp-壳区持续存在。我们还讨论了α -星团图像在^<94>Mo和^<212>Po等更重的原子核中持续存在，并且可能在整个元素周期表中都存在。少

1.It has been shown that the structure of ^<44>Ti including the alpha-spectroscopic factors is consistently understood in an alpha-cluster model. The K = 0^+ band starting at 1.9 MeV is explained by the alpha-cluster model in which excitation of the core is taken into account.2. The predicted K = 0^- band in ^<40>Ca has been observed in the ^<36>Ar (^6Li, d) ^<40>Ca reaction and it was found the alpha-spectroscopic factors of the band are fragmented. By taking a semimicroscopic alpha+^<36>Ar orthogonality condition model which takes into account the excitation of the core, we could reproduce well the experimental energy levels, spectroscopic factors and B (E2) values. It was also found that the model reproduces not only the cluster states but also the shell-model like states simultaneously. The mechanism of coexistence of cluster and shell structure is revealed.3. The structure of ^<42>Ca was studied in the alpha+^<38>Ar orthogonality condition model. Experimental energy levels and B ( … More E2) values are well reproduced by the model. It is found that cluster and shell structure also coexist in ^<42>Ca.4.alpha-clustering aspects are also studied in the latter part of the sd-shell from the viewpoint of unification of bound and scattering states. Through the study of alpha-cluster structure of ^<38>Ar, it is suggested that weak-coupling and alpha-cluster structure persist in this region.5. Extension of the viewpoint of molecule-like structure in nuclei to much heavier region has been done. It was found that alpha-scattering from ^<90>Zr and ^<208>Pb and the ground band of the composite system ^<94>Mo and ^<212>Po are simultaneously reproduced well, respectively, by taking a double folding model. This shows that the ground band of these nuclei is understood from the alpha-cluster viewpoint. Spectroscopic properties and band structure of ^<94>Mo and ^<212>Po were investigated. The large alpha-decay width of the ground state of ^<212>Po is reproduced well by the cluster model.To summarize, if is found theoretically and experimentally that alpha-cluster structure persists in the fp-shell region. It is also discussed that alpha-cluster picture persists in much heavier nuclei such as ^<94>Mo and ^<212>Po, and possibly throughout the periodic table. Less